What does Acts 23:3 mean?
The Sanhedrin is interrogating Paul, because the Roman tribune wants to know why he was attacked in the temple. The Roman official hopes the Jewish religious leaders can lend some insight. It isn't going well. Paul's not interested in the mob attack. He's focused on bringing the members of the Sanhedrin to accept Jesus as their Messiah. He starts by insisting on his innocence. The Sanhedrin considers him a heretic, however, and the high priest has him struck (Acts 23:1–2).Paul is startled, insulted, and indignant. This is not a criminal trial and he has not been convicted; they have no right to punish him. Deuteronomy 25:1–3 says a person may be beaten only if they are convicted of a crime. The comparison to a "whitewashed wall" is probably related to Jesus' description of the Pharisees to whitewashed tombs (Matthew 23:27). Both metaphors refer to someone who looks respectable on the outside but is corrupt and rotten on the inside.
Apparently, Paul doesn't know that the authority behind the blow is the high priest Ananias. Some scholars posit it has been so long since Paul was in Jerusalem he didn't know which of the men before him is the high priest. Others think the "thorn" in his flesh (2 Corinthians 12:7) is continued eyesight problems from when he first saw Jesus (Acts 9:3–9). When he is told, he semi-apologizes, inferring he didn't know because Ananias wasn't acting like a high priest (Acts 23:5).
Acts 23:1–11 records a Roman military tribune's last effort to uncover why a mob attacked Paul. The crowd dragged him out of the temple and beat him mercilessly (Acts 21:27–33). The tribune asks the Sanhedrin for help, but there are too many divisions. The Sanhedrin can't abide Christians. Paul can't fathom their rejection of Jesus. The Sadducees and Pharisees quickly fall into an old fight about the resurrection of the dead. The tribune takes Paul back to the barracks where, that night, Jesus tells Paul he's on his way to Rome.
Acts 23 continues the tribune's attempt to discover why a mob of Jews suddenly turned violent and attacked Paul (Acts 21:27–33). He takes Paul to the Sanhedrin to see if they understand what his crime is. Paul barely begins his story when he is slapped for impudence. He disrespects the high priest and starts a fight between the Pharisees and Sadducees. The next day, a group of forty Jews invite the Sanhedrin to help them murder Paul. Paul's nephew reports the plot to the tribune who gives up and sends Paul to the governor. The governor awaits Paul's accusers for trial.